ultraviolet
1. [ noun ] (physics) radiation lying in the ultraviolet range; wave lengths shorter than light but longer than X rays
Synonyms: ultraviolet_light ultraviolet_radiation ultraviolet_illumination UV
Related terms: actinic_radiation sun-ray
2. [ adjective ] having or employing wavelengths shorter than light but longer than X-rays; lying outside the visible spectrum at its violet end
Examples:

"ultraviolet radiation" "an ultraviolet lamp"

Related terms: invisible
Similar spelling:   ultramodern
  ultramontane